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Copper Pour Corrupted?

Something weird has happened to my design.  I am using V7.2.

After many weeks, suddenly, one of my copper pours no longer maintains clearance from other nets.  I had to change the width of the outline to 10 mils to get 10mils of clearance.  This pour did not do this before and none of my other pours have this issue.   Also another pour of the same net does not remove isolated islands - but does keep proper clearance.

I deleted the pour outline and re-drew it but the problem did not go away.

Has my design become corrupted?  Is there some quirk of copper pours that I missing?